DIRECT MEASUREMENTS OF THE GENERAL MAGNETIC FIELD ON THE SOLAR-LIKE STARS

S. I. Plachinda, C. M. Johns-Krull, T. N. Tarasova

Анотація


We report the high-precision spectropolarimetric measurements of the general magnetic field (GMF) on a solar-like star 61 Cyg A. The magnetic field shows periodic variations due to stellar rotation with a period of Pmf = 36.59 ± 0.18 days. The net longitudinal magnetic field of 61 Cyg A varied from –13 G to + 4 G. The conclusion was made that the nonaxisymmetric large-scale magnetic field (original magnetic field - OMF) on the surface of the Sun and solar-like stars ξ Boo A and 61 Cyg A is present in addition to toroidal and axisymmetric poloidal fields, which are produced by dynamo. The characteristics of the OMF point to a presence of a global magnetic field in the star radiative interior and re internal field properties on the surface. The birth and formation of magnetic active regions (ARs) on the surface of the solar-like star 61 Cyg A has been registered. The numerical simulations were compared with magnetic measurements, and lead us to the conclusion about the presence on 61 Cyg A of more strong magnetic of ARs (∼ 1023 – 1024 Mx) than on the Sun. These ARs can be formed at the same latitudes as on the Sun.

Ключові слова


Stars; late-type; stars; individual; 61 Cyg A; ξ Boo A; Sun; stars; magnetic fields.

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Alekseev I.Yu., Gershberg R.E.: 1997, Astron. Rep., 41, 207

Alfven H.: 1981, Cosmic plasma, Dordrecht et al., Reidel

Baliunas S.L., et al.: 1995, ApJ, 438, 269

Berdyugina S.V., Tuominen I.: 1998, As.Ap., 336, 25

Borra E.F., Edwards G., Mayor M.: 1984, ApJ, 284, 211

Brown D.N., Landstreet J.D.: 1981, ApJ, 246, 899

Dudorov A.E., Krivodubskij V.N., Ruzmaikina T.V., Ruzmaikin A.A.: 1989, SvA, 33, 420

Gough D.O., McIntyre M.E.: 1998, Nature, 394, 755

Hubrig S., Plachinda S.I., Hunsch M., Schroder K.-R: 1994, As.Ap., 291, 890

Johns-Krull C.M. and Valenti, J. A. 1996: ApJ, 459, L95

Kitchatinov L.L., Jardine M., Cameron A.C.: 2001, As.Ap., 374, 250

Korhonen H., Berdyugina S.V., Hackman T., Duemmer R., Ilyin I.V., Tuominen I.: 1999, As.Ap., 346, 101

Kotov V.A., Scherrer P.H., Howard R.F., Haneychuk V.I.: 1998, ApJS, 116, 103

McGregor K.B., Charbonneau P.: 1999, ApJ, 519, 911

Mestel L.: 1967, in The magnetic and related stars, Ed. R.C.Cameron, (Baltimore: Mono Book Corp.), 101

Parker E.N.: 1981, Geophys. Astrophys. Fluid Dyn., 18, 175

Plachinda S.I., Tarasova T.N.: 2000, ApJ, 533, 1016

Pudovkin M.I., Benevolenskaya E.E.: 1984, SvA, 28, 458

Rudiger G., Kitchatinov L.L.: 1977, Astron. Nachr., 318,273

Saar S.H.: 1994, IAU Symp. 154, Infrared Solar Physics, ed. D.M. Rabin et al., Dodrecht, Kluwer, 493

Saar S.H., Linsky J.L.: 1985, ApJ, 299, L47

Savanov I.S. Savelyeva Y.Y.: 1996, Astrofizika, 39, 5

Scherrer P.H., Wilcox J.M., Svalgaard L., Duvall T.L., Dittmer P.H., Gustafson E.K.: 1977, Sol. Phys., 54, 353

Schussler M.: 1975, As.Ap., 38, 263

Severny A. B.: 1969, Nature, 224, 53.

Sheeley N.R.: 1969, Sol.Phys., 9, 347

Zhang L.D., Zirin H., Marquette W.H.: 1997, Sol. Phys., 175, 59




DOI: https://doi.org/10.18524/1810-4215.2001.14.99480

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